The problem I have is that it's not the people who own the planes making the rules. And it's not even necessarily the government of the country in which I'm flying who's originated the rules. There are now so many treaties and inter-country agreements about airline regulation that if the 900lb gorilla in the international civil aviation industry (the US) decides that liquids are bad, then everyone else has play by their rules.
"Necessity is the mother of invention" is a silly proverb. "Necessity is the mother of futile dodges" is much nearer the truth. -- Alfred North Whitehead